This trail is not well-marked at all, and frequently crosses back and forth over the creek. (This is a lot of fun if you don't mind getting your feet wet.) Once the trail leaves the creek, though, it gets hot and flat and boring, and if you don't want to turn around and walk back across the creek a billion times, you have to finish by walking two miles down the park's dirt road. Some basic climbing/scrambling skills are helpful.
Overall, I really enjoyed it, but it's not for everyone.
"This book will be in great demand by travelers, park visitors, and aficionados of Texas landscapes."